Akhbarizadeh Razegheh, Moore Farid, Keshavarzi Behnam, Moeinpour Alireza
Department of Earth Sciences, College of Science, Shiraz University, 71454 Shiraz, Iran.
Department of Earth Sciences, College of Science, Shiraz University, 71454 Shiraz, Iran.
Environ Pollut. 2017 Jan;220(Pt A):720-731. doi: 10.1016/j.envpol.2016.10.038. Epub 2016 Oct 18.
Marine pollutants are becoming a growing concern due to their ecological consequences. This study investigates the potential risk posed by microplastics and toxic elements in coastal sediments of Khark Island, the main oil export hub of Iran. Principal component biplots exhibited a significant positive correlation between microplastic quantities (ranging in shape and color) and concentration of heavy metals with industrial activity. Source identification of the heavy metals indicated both natural and anthropogenic origin. Quality and risk assessment of the sediments revealed low to moderate pollution of Zn, Mo, Pb, Cu, Cd and As in some stations. Results of metal fractionation in sediments demonstrated that Cd, Mn, Zn, As and Pb are capable of posing a serious ecological risk due to potential bioavailability. Microplastics, mostly fragments and fibers, were detected in all sediment samples (ranging from 59 to 217 items/200 g dry sediment). A relatively good significant linear relationship exists between microplastic quantities and potentially toxic element/polycyclic aromatic hydrocarbon concentrations in coastal sediments. The results of this study confirmed the key role of microplastics as a "potential contaminant vector" for other types of pollutants.
由于海洋污染物的生态影响，其日益受到关注。本研究调查了伊朗主要石油出口枢纽哈尔克岛沿海沉积物中微塑料和有毒元素带来的潜在风险。主成分双标图显示，微塑料数量（形状和颜色各异）与重金属浓度和工业活动之间存在显著正相关。重金属的来源识别表明其兼具天然和人为来源。沉积物的质量和风险评估显示，部分站点的锌、钼、铅、铜、镉和砷污染程度为低至中度。沉积物中金属分级结果表明，镉、锰、锌、砷和铅由于潜在的生物可利用性，可能构成严重的生态风险。在所有沉积物样本中均检测到微塑料，主要为碎片和纤维（含量范围为59至217个/200克干沉积物）。沿海沉积物中微塑料数量与潜在有毒元素/多环芳烃浓度之间存在相对良好的显著线性关系。本研究结果证实了微塑料作为其他类型污染物“潜在污染载体”的关键作用。
